Exercises

The mean weight of players on a football team is 77 Kg. The weights are:

72, 100, 60, 96, 92, 60, 64, 100, 72, 64, 60, 80, 100, 72, 84, 60, 76, 92, 64, ? , where one number is missing. Find it.
The misssing value is Kg.